# Diagnostics

In addition to the diagnostic variables described in the Devices [<mark style="color:blue;">section</mark>](/tags-and-devices/devices/diagnostics.md), the Modbus device in slave mode also has the following diagnostic variables:

**Current Connections (Modbus TCP only):** contains the current number of connections to the server.

**Incoming Read Requests:** contains the number of incoming read requests for the current slave identifier.

**Incoming Write Requests:** contains the number of incoming write requests for the current slave identifier.

**Last Incoming Read Utc Time:** contains the UTC time of the last incoming read request for the current slave identifier.

**Last Incoming Write Utc Time:** contains the UTC time of the last incoming write request for the current slave identifier.


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